The faithfull 21mm varipitch bi metal hole saw is perfectly sized for common electrical and plumbing installations across residential and commercial projects. This 21mm holesaw is ideally suited for drilling conduit entry points, installing cable management systems, creating mounting holes for standard electrical boxes, and general construction applications. Featuring bi metal construction with 8% cobalt content, this 21mm holesaw provides exceptional heat and wear resistance for prolonged service life in professional environments. The precision set teeth deliver aggressive cutting action with excellent swarf clearance, maintaining smooth, fast progress through various materials and thicknesses. The 21mm holesaw excels across a comprehensive range of materials including stainless steel, steel, aluminium, sheet metal, mild metal, non ferrous metals, cast iron, soft and hard woods, and pvc. Designed for use with most variable speed power drills, it cuts through both thin and thick gauge materials effectively. Features and benefits bull 21mm diameter for standard electrical and plumbing installations bull 8% cobalt bi metal construction for exceptional durability bull precision teeth for aggressive, clean cutting bull wide material compatibility for diverse applications bull variable speed drill compatible specifications size mm 21 material bi metal pitch variable cutting depth 38mm diameter 21mm